Fuji Electric ALPHA7, User Manual

Page: 174 / 662

CHAPTER 3 OPERATION
Operation with VS Type
3-11
3
3.4.2 Speed Control
The shaft rotation speed is controlled in the speed control mode according to the speed command
voltage input [VREF] of the servo amplifier or parameter setting.
If parameter PA1_01 is set at "1," the speed control mode starts after the RDY signal is turned on.
While the manual forward command [FWD] or manual reverse command [REV] signal is turned on, the
motor accelerates and turns at a constant speed, and deceleration starts when the signal is turned off.
Use the ACC (14) input signal to switch the acceleration/deceleration time.
The acceleration/deceleration time follows the parameter setting.
The rotation speed follows the X1 (51), X2 (52) and X3 (53) input signals or speed command voltage
[VREF].
In the below chart, the operation is executed with the speed corresponding to VREF.
First when the X1 signal is turned on, the operation is executed with the speed corresponding to the X1
signal (rotation speed setting in PA1_41).
Then the operation decelerates and stops after turning the FWD signal off.
Use parameter PA3_35 to specify the zero clamp level in relation to the [VREF] input.
The following signal is active in the speed control mode.

Zero speed
The signal is turned on if the feedback speed of the motor (present shaft rotation speed of motor)
falls below a certain value.
OFF ON
[RDY]
ON
ON
Speed
OFF
OFF ON
Zero speed
Manual forward command
[FWD]
Multi-step speed [X1]